CN201489799U - LED display screen and power supply circuit thereof - Google Patents
LED display screen and power supply circuit thereof Download PDFInfo
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- CN201489799U CN201489799U CN2009202042677U CN200920204267U CN201489799U CN 201489799 U CN201489799 U CN 201489799U CN 2009202042677 U CN2009202042677 U CN 2009202042677U CN 200920204267 U CN200920204267 U CN 200920204267U CN 201489799 U CN201489799 U CN 201489799U
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- 230000006837 decompression Effects 0.000 claims description 22
- 230000009466 transformation Effects 0.000 claims description 22
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 239000003990 capacitor Substances 0.000 description 9
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- 238000005516 engineering process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model relates to an LED display screen and a power supply circuit thereof. The LED display screen comprises a plurality of LEDs and a power supply used for supplying power to the LEDs. A power supply circuit comprises a switching power supply, a voltage regulation circuit and a constant current power supply. The voltage regulation circuit is used for regulating the voltage direct current supplied by the switching power supply and applying the regulated voltage direct current to the LEDs, and the constant current power supply is used for keeping the current flowing through the LEDs constant. The LED display screen re-regulates the voltage direct current supplied by the switching power supply by using the voltage regulation circuit, so that the system can adopt relatively high voltage transmission mode to reduce energy consumption. The voltage regulation circuit further conducts regulated power supply to different LEDs and dispenses with dividing resistance, so as to further reduce the energy consumption and improve the power supply efficiency. In addition, the cabinet structure of the LED display screen can realize ultrathin, light-weight and general design, and is suitable for all LED display screen fields.
Description
[technical field]
The utility model relates to a kind of LED and shows field, particularly a kind of LED display and feed circuit thereof.
[background technology]
The LED technology is one of high-tech sector of the tool development prospect in the whole world in recent years, and in the illumination application, LED reaches more than 60% than incandescent lamp is energy-conservation.Yet all LED display are almost all continued to use traditional design method at present, adopt the low-voltage, high-current powering mode, have defectives such as energy consumption is big, efficient is low, screen body thermal value is big.Therefore, existing LED display also becomes the energy consumption rich and influential family when meeting the need of market.Therefore the energy-saving and cost-reducing main flow trend of society now that become develop low energy consumption, high-level efficiency LED product is extremely urgent.
See also Fig. 1, Fig. 1 has shown a kind of LED display of prior art.This LED display comprises: Switching Power Supply 104, a plurality of light emitting diode (LED) 101,102,103 and a plurality of constant current source 107,108,109.When LED display showed, the alternating voltage of the 220V/50HZ that Switching Power Supply 104 will receive from external electrical network was directly changed into the DC voltage of 5V, and to LED 101,102,103 power supplies, cause the energy consumption of system big, efficient is low.In addition, the anode of LED 101,102,103 is connected to the output terminal of Switching Power Supply 104 jointly, and the negative electrode of LED 101,102,103 is connected with constant current source 107,108,109 respectively.The effect of constant current source 107,108,109 is that the electric current of the feasible LED 101,102,103 that flows through keeps constant.In the prior art, LED 101,102,103 generally is divided into the LED of red-light LED, green light LED, three kinds of different colours of blue-ray LED.The driving voltage of red-light LED, green light LED, blue-ray LED tends to distinguish to some extent.For example, the driving voltage of red-light LED, green light LED, blue-ray LED may be respectively 2.1V, 3.2V, 3.2V.At this moment, obtain correct driving voltage for guaranteeing red-light LED, the divider resistance 105 of red-light LED need being connected makes that the useless energy consumption of existing LED display is big, thermal value is big, the heat radiation difficulty, and can shorten the serviceable life of display screen.Because the heat of above-mentioned LED display is big, its casing thickness is greater than 120mm (low-light level screen/indoor application) usually, then is greater than 150mm for the high brightness of outdoor screen, and a plurality of fans heat radiations must be arranged, casing universalization, standardization level are very low, the manufacturing cost height.
[utility model content]
In order to solve big, the inefficient technical matters of energy consumption of existing LED display, the utility model provides a kind of low energy consumption, high-efficiency LED display screen and feed circuit thereof.
The feed circuit that the LED display that the utility model provides comprises a plurality of LED and is used to the LED power supply, these feed circuit comprise Switching Power Supply, voltage-regulating circuit and constant current source, wherein voltage-regulating circuit is used for the DC voltage that Switching Power Supply provides is adjusted, adjusted DC voltage is applied on each LED, the electric current that constant current source is used for feasible each LED that flows through keeps constant again.
According to the utility model one preferred embodiment, LED comprises green light LED, blue-ray LED and red-light LED, voltage-regulating circuit comprises three decompression transformation electronic circuits, the corresponding respectively decompression transformation electronic circuit that connects in these three decompression transformation electronic circuits of green light LED, blue-ray LED and red-light LED, these three decompression transformation electronic circuits provide respectively and drive green light LED, blue-ray LED and the required driving voltage of red-light LED.
According to the utility model one preferred embodiment, Switching Power Supply is configured to the alternating voltage from the external electrical network input is converted to the DC voltage of 24V.
According to the utility model one preferred embodiment, voltage-regulating circuit is adjusted DC voltage according to the voltage drop of LED and constant current source.
According to the utility model one preferred embodiment, LED display also comprises casing, and casing holds LED and feed circuit.
According to the utility model one preferred embodiment, the casing thickness of LED display is for being less than or equal to 120mm.
The feed circuit of the LED display that the utility model provides comprise Switching Power Supply, voltage-regulating circuit and constant current source, wherein voltage-regulating circuit is used for the voltage that Switching Power Supply provides is adjusted, adjusted voltage is applied to respectively on each LED of LED display, the electric current that constant current source is used for the feasible LED that flows through keeps constant again.
According to the utility model one preferred embodiment, LED comprises green light LED, blue-ray LED and red-light LED, voltage-regulating circuit comprises three decompression transformation electronic circuits, the corresponding respectively decompression transformation electronic circuit that connects in these three decompression transformation electronic circuits of green light LED, blue-ray LED and red-light LED, these three decompression transformation electronic circuits provide respectively and drive green light LED, blue-ray LED and the required driving voltage of red-light LED.
Compared with prior art, the utility model utilizes voltage-regulating circuit that the DC voltage that Switching Power Supply provides is adjusted once more, and the system that makes can take the transmission mode of relatively high pressure, has reduced energy consumption.This voltage-regulating circuit further carries out adjustable power supply respectively to different LED, has cancelled divider resistance, has further reduced energy consumption, has improved power-efficient.In addition, the body structure of LED display can be realized ultra-thinization, lightness, General design, is applicable to all LED display fields.
[description of drawings]
Fig. 1 has shown a kind of LED display of prior art;
Fig. 2 has shown the LED display according to the utility model one embodiment;
Fig. 3 has shown the physical circuit figure according to the voltage-regulating circuit of the utility model one embodiment;
Fig. 4 has shown the casing according to the LED display of the utility model one embodiment.
[embodiment]
See also Fig. 2, Fig. 2 has shown the LED display according to the utility model one embodiment.This LED display comprises: a plurality of LED 201,202,203, Switching Power Supply 204, voltage-regulating circuit 205 and a plurality of constant current source 207,208,209.Switching Power Supply 204, voltage-regulating circuit 205 and a plurality of constant current source 207,208,209 constitute the feed circuit of above-mentioned LED 201,202,203.The effect of Switching Power Supply 204 is to convert the DC voltage of 24V from the alternating voltage of the 220V/50HZ of external electrical network input to.Then, the DC voltage of 205 couples of 24V of voltage-regulating circuit is carried out the voltage adjustment once more, and adjusted DC voltage is applied on the LED 201,202,203, makes LED display can adopt the high voltage transmission mode thus, has reduced system energy consumption.
In the present embodiment, LED 201,202,203 is respectively green light LED 201, blue-ray LED 202 and red-light LED 203.The anode of green light LED 201, blue-ray LED 202 and red-light LED 203 is connected respectively to three voltage output ends of voltage-regulating circuit 205.The negative electrode of green light LED 201, blue-ray LED 202 and red-light LED 203 is connected with constant current source 207,208,209 respectively.The effect of constant current source 207,208,209 is that the electric current of feasible flow through green light LED 201, blue-ray LED 202 and red-light LED 203 keeps stable.
Referring to Fig. 3, Fig. 3 has shown the physical circuit figure according to the voltage-regulating circuit of the utility model one embodiment.In the present embodiment, comprise three decompression transformation electronic circuits (BUCK electronic circuit) in the voltage-regulating circuit 205.These three decompression transformation electronic circuits comprise integrated chip U4, U5 and the U6 that is integrated with switch MOS pipe and pulse-width modulation circuit respectively.The voltage input end of integrated chip U4, U5 and U6 is connected to the voltage input end DC of Switching Power Supply 204.Pulse-width modulation circuit is used for the duty cycle of switching of gauge tap metal-oxide-semiconductor, with the dutycycle of the voltage signal of control integrated chip U4, U5 and U6 output.The voltage output end of integrated chip U4, U5 and U6 is connected with output filter circuit respectively.In the present embodiment, output filter circuit comprises resistance R 1 and capacitor C 1, resistance R 2 and capacitor C 2 and resistance R 3 and the capacitor C 3 that is connected in series respectively.These three decompression transformation electronic circuits further comprise respectively sustained diode 1, D2, the D3 in parallel with resistance R 1 and capacitor C 1, resistance R 2 and capacitor C 2 and resistance R 3 and capacitor C 3.Node between resistance R 1 and capacitor C 1, resistance R 2 and capacitor C 2 and resistance R 3 and the capacitor C 3 is as voltage output end VG, VB and the VR of three decompression transformation electronic circuits, and it provides respectively and drives the required driving voltage of green light LED 201, blue-ray LED 202 and red-light LED 203.These three decompression transformation electronic circuits further comprise the feedback circuit that the output voltage of voltage input end VG, VB and VR is fed back to integrated chip U4, U5 and U6.Adjust the ratio of resistance R 17 and R18, R21 and R22 and R25 and R26 in each feedback circuit respectively according to the voltage drop of green light LED 201, blue-ray LED 202 and red-light LED 203 and constant current source 207,208 and 209, can change the duty cycle of switching of switch MOS pipe, and then adjust the energy that is injected in each output filter circuit, also just can adjust the voltage swing that each voltage input end VG, VB and VR go up output.
For example, voltage input end VG, the VB of three decompression transformation electronic circuits by pulse width modulation mode control voltage-regulating circuit 205 and the DC voltage that VR exports 3.6V, 3.6V, 2.5V respectively, constant current source 207,208 and 209 pressure drop are 0.4V, and the pressure drop of green light LED 201, blue-ray LED 202 and red-light LED 203 is respectively 3.2V, 3.2V, 2.1V, then can and then avoid the use of divider resistance.
See also Fig. 4, Fig. 4 has shown the casing according to the LED display of the utility model one embodiment.In the present embodiment, the effect of casing is that LED and the feed circuit that hold in the LED display are avoided damaging to protect it.Compare with the LED display casing of prior art, the thickness of LED display casing of the present utility model can be arranged to be less than or equal to 120mm, thereby greatly reduces the thickness of casing, has alleviated weight.In addition, the casing of different size is except that panel and back plate, and all the other annexes can be realized standardization, universalization, can realize succinct, assembling fast, has simplified wrappage and design, has reduced transportation cost.
In the above-described embodiments, only the utility model has been carried out exemplary description, but those skilled in the art can carry out various modifications to the utility model after reading present patent application under the situation that does not break away from spirit and scope of the present utility model.
Claims (8)
1. LED display, the feed circuit that described LED display comprises a plurality of LED and is used to described LED power supply, it is characterized in that, described feed circuit comprise Switching Power Supply, voltage-regulating circuit and constant current source, wherein said voltage-regulating circuit is used for the DC voltage that described Switching Power Supply provides is adjusted, adjusted described DC voltage is applied on each described LED, the electric current that described constant current source is used for feasible each described LED that flows through keeps constant again.
2. LED display according to claim 1, it is characterized in that, described LED comprises green light LED, blue-ray LED and red-light LED, described voltage-regulating circuit comprises three decompression transformation electronic circuits, the corresponding respectively decompression transformation electronic circuit that connects in described three decompression transformation electronic circuits of described green light LED, described blue-ray LED and described red-light LED, described three decompression transformation electronic circuits provide respectively and drive described green light LED, described blue-ray LED and the required driving voltage of described red-light LED.
3. LED display according to claim 1 is characterized in that, described Switching Power Supply is configured to the alternating voltage from the external electrical network input is converted to the DC voltage of 24V.
4. LED display according to claim 1 is characterized in that described voltage-regulating circuit is adjusted described DC voltage according to the voltage drop of described LED and described constant current source.
5. LED display according to claim 1 is characterized in that described LED display also comprises casing, and described casing holds described LED and described feed circuit.
6. LED display according to claim 5 is characterized in that, the casing thickness of described LED display is for being less than or equal to 120mm.
7. the feed circuit of a LED display, it is characterized in that, described feed circuit comprise Switching Power Supply, voltage-regulating circuit and constant current source, wherein said voltage-regulating circuit is used for the voltage that described Switching Power Supply provides is adjusted, adjusted described voltage is applied to respectively on each LED of LED display, the electric current that described constant current source is used for the feasible described LED that flows through keeps constant again.
8. feed circuit according to claim 7, it is characterized in that, described LED comprises green light LED, blue-ray LED and red-light LED, described voltage-regulating circuit comprises three decompression transformation electronic circuits, the corresponding respectively decompression transformation electronic circuit that connects in described three decompression transformation electronic circuits of described green light LED, described blue-ray LED and described red-light LED, described three decompression transformation electronic circuits provide respectively and drive described green light LED, described blue-ray LED and the required driving voltage of described red-light LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202042677U CN201489799U (en) | 2009-08-24 | 2009-08-24 | LED display screen and power supply circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202042677U CN201489799U (en) | 2009-08-24 | 2009-08-24 | LED display screen and power supply circuit thereof |
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| CN201489799U true CN201489799U (en) | 2010-05-26 |
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| CN2009202042677U Expired - Fee Related CN201489799U (en) | 2009-08-24 | 2009-08-24 | LED display screen and power supply circuit thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826302A (en) * | 2010-06-07 | 2010-09-08 | 福建科维光电科技有限公司 | Selective energy-saving circuit of LED full-color screen |
| CN102693697A (en) * | 2012-06-11 | 2012-09-26 | 长沙信元电子科技有限公司 | Power supply method and system for three-sided turnover screen |
| CN103150994A (en) * | 2013-03-29 | 2013-06-12 | 广东威创视讯科技股份有限公司 | Light-emitting diode (LED) display control circuit and display screen |
| CN109326249A (en) * | 2018-12-19 | 2019-02-12 | 安徽智迪信息科技有限公司 | A kind of energy conservation display system |
| CN109377939A (en) * | 2018-11-16 | 2019-02-22 | 上海得倍电子技术有限公司 | A kind of high efficiency LED drive device |
-
2009
- 2009-08-24 CN CN2009202042677U patent/CN201489799U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826302A (en) * | 2010-06-07 | 2010-09-08 | 福建科维光电科技有限公司 | Selective energy-saving circuit of LED full-color screen |
| CN101826302B (en) * | 2010-06-07 | 2012-05-30 | 福建科维光电科技有限公司 | Selective energy-saving circuit of LED full-color screen |
| CN102693697A (en) * | 2012-06-11 | 2012-09-26 | 长沙信元电子科技有限公司 | Power supply method and system for three-sided turnover screen |
| CN103150994A (en) * | 2013-03-29 | 2013-06-12 | 广东威创视讯科技股份有限公司 | Light-emitting diode (LED) display control circuit and display screen |
| CN109377939A (en) * | 2018-11-16 | 2019-02-22 | 上海得倍电子技术有限公司 | A kind of high efficiency LED drive device |
| CN109377939B (en) * | 2018-11-16 | 2023-10-13 | 上海得倍电子技术有限公司 | High-efficiency LED driving device |
| CN109326249A (en) * | 2018-12-19 | 2019-02-12 | 安徽智迪信息科技有限公司 | A kind of energy conservation display system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20170824 |